Digest

A digest is a hash value of the whole message. This is used to detect if a given message has been tampered.

Response headers

Digest

Provides digest/hash of the requested resource.

Digest: <digest-algorithm>=<digest-value>
Digest: <digest-algorithm>=<digest-value>,<digest-algorithm>=<digest-value>
Digest: sha-256=X48E9qOokqqrvdts8nOJRJN3OWDUoyWxBf7kbu9DBPE=
Digest: sha-256=X48E9qOokqqrvdts8nOJRJN3OWDUoyWxBf7kbu9DBPE=,unixsum=30637

Request headers

Want-Digest

Requests the server to provide the digest of the requested resource, using any of the given algorithm(s). You can give "quality values" to denote priorities in the list, e.g. Want-Digest: sha-512;q=0.3, sha-256;q=1, md5;q=0.

If the server does not support any of the digest given, it should respond with 400 (Bad Request), while listing the algorithms it support in the Want-Digest response header.

Want-Digest: <digest-algorithm>
Want-Digest: <digest-algorithm><q-value>,<digest-algorithm><q-value>, ...

References

• Digest (MDN) — https://developer.mozilla.org/en-US/docs/Glossary/Digest
• Digest (MDN) — https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Digest
• Want-Digest (MDN) — https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Want-Digest